Improved pick for dressing- millstones



m y @gc/o gianni ittici t o www CORNELIUS WHITEHOUSE, OF BRI'DGTOWN,NEAR 'CANNOCIQ ENGLAND.

` Leners Patent No. 87,530, (Imaz Mfr/rch 2, 1869.

IMPRovnn PICK FOR DRESSING MILLsToNns,

The schedule referred to in' these Lette rs Patent and making part ofthe same.

To all to whom it 'may concern Mill-bills for dressing lnillstones, asordinarily coni structed,.consist of ahead made of steel, the said headlhaving a wooden handle. Each end of the head is ground to a sharpchisel-edge. After the edges have been worn by use, the ends require tobe drawn out by a smith, and rehardened and ground. This requires to bedone repeatedly, and is not only 'troublesome and expensive, butfrequently results in injury to the steel,

and consequent imperfection in the implement.

Iii-making mill-bills according to my invention, I make the ends, oracting-portions,.separate from the head. I make the said ends of fiatbars of steel, the acting-end being ground to a chisel-edge, and theother end having an enlargement or head upon it.

These chisel-ends are inserted and fixed in the head, or frame of themill-bill in the following manner:

The said head,'or frame of the bill is nearly ofthe ordinary form, butis made hollow, and divided, in the diretion of its length, in a planeat right angles to the han le. l

The top half of the head, or frame is ixed to the handle, and the otherhalf is capableof sliding on the handle, so as to be brought in contactwith or separated from the other half.

In fixing the chisel-ends in the bill-head, or frame, the two parts ofthe head, or frame are separated, and the chisel-ends are placed betweenthem, so that their acting-ends project about an inch lfrom the head, orframe. The movable part of the head, or frame is then closed upon thefixed part, and secured in its' place by a wedge passed through thchandle, the chiselends being fixed, griped, and held, between the twoparts of the head, or frame.

The inner faces of the two parts ofthe head, or frame are provided withnotches, into which the enlargements, or heads on the chisel-ends tit,and which prevent the saidends being forced during use into the bead, orframe of the bill.`

When the chisel-edges of the ends are worn, they are removed from thehead, or frame of the bill, by unwedging the movable part, and by simplygrinding them they are restored to a proper workin g-condition, noheating, forging, and hardening of the ends being necessary.

Instead of fixing thc movable part of the head, or frame by means of awedge, it may he fixed by a screw or otherwise.

'In making mill and other picks accor ng to my invention, I substitutedat bars of steel,l having points instead of chisel-edges.

Bills and picks made according to my invention may also be employed fordressing stone for various purposes.

Having explained the nature of my invention, I w1ll proceed to describe,with reference to the accompanying drawings, the manner in which thesame is to be performed.

Figure l represents, in elevation, a mill-bill for dressing millstones,constructed according to my invention, and

Figure 2 is an end elevation of the same.

Figure 3 is a longitudinal section of the same, handle being broken off.

Figure 4 represents the two parts of the head of the bill, separated,and v Figure 5 represents a plan of the yinner side ofthe fixed half ofthe bill-head, or frame. v Figure 6 represents one of the chisel-ends ofthe bill separately.

rIhe same letters of reference indicate the same parts in each ligure ofthe drawing.

a b are the two parts, or halves of the bill-head, or frame, the toppart or half a of which is fixed to the metallic end c of the handle cf,andthe bottom part or-half b of which is capable of sliding on the partc of the handle, so as to be brought in contact with or separated fromthe top half, a.

The said halves a b are hollow, so that when they are brought together,a space is left, of a size proper to receive the separate chisel-ends dd.

These chisel-ends are made of flat bars of steel, having a chisel-edge,d?, on one end, and an enlargement, or head, d3, on the other end. Theshape of the separate chisel-ends, or acting-parts of the' bill-head, orframe will be best seen by neferring to the detached view of achisel-end, fig. 6.

The inner faces of the two parts a b of the bill-head, or frame, areprovided with notches, marked a? b2, into which the enlargements, orheads, d3, of the chisel-ends are fitted, as represented in fig. l

In fixing the'chisel-ends d d, in the bill-head, or frame, the two partsc b are separated, as illustrated in iig, 4, and the chisel-ends d (Zare placed between them, so

the

enlargements, or heads, cl3, of the chisel-ends being dropped into thenotches of one or other of the parts a b closed upon the fixed part c,and the said part b is secured in its place by a wedge, e, passedthrough the handle c, as illustrated in iigs. 1 and 3, or by a screw, or,other equivalent means.

By the closing of the movable part b upon the fixed part a, thechisel-endsv d d are fixed in the notches a2 b2, and the iiat parts ofthe chisel-ends are griped, and firmly held throughout their lengthbetween the two parts a-Lb,-and the mill-bill is ready for use, the

that they project about an inch from the head, the

'I he movable part b of the head, or frame, is thenv the points of thebill-head, or frame, so as to make the chisel-ends project the requireddistance from the said bill-head, or frame.

By substituting fiat bars of steel, having points, for the bars havingchisel-ends, represented in the drawing, the bill is converted into amill or other pick.

It will be noticed, that by making the lower jaw of the head capable ofsliding upon the handle, the adjustment of this jaw is effected withmuch greater ease than has heretofore been practicable, and that thechisel-ends inserted between the jaws are griped, and held throughouttheir entire length, thus assuring the steadiness of 4the acting-ends.

Having now described the nature of my invention, and the manner in whichthe same is to-be performed, I wish it to be understood that I do notclaim broadly a mill-bill composed of a divided head, with detachedchisel,I orf'acting-ends, for l am aware that such tools have beenheretofore used; but -What I do claim, and desire to secure by LettersPatent, is

A mill-bill, or pick, for dressing stone, the head, or frame, of whichis composed of two parts, the one fixed, the other movable, and slidingupon the handle, the said parts being notched and vconstructed to gripeand be in Contact with that portion of the removable chisel, oractingends,`placed between them, substantially as and for the purposesshown and set forth.

CORNELIUS WHITEHOUSE. [L s] Witnesses:

GEORGE SHAW,

7 Cannon Street, Birmingham. RICHARD SKERRETT,

7 Cannon Street, Birmingham.

